2nd Year Apprentice Training (12 Months)

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Practical Assessment

Install 3 phase outlet

• Correct Polarity

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• Terminations

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Install 2 way light Switch

• Correct Polarity

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• Switches operate correctly

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• Terminations

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Testing

• Test for dead - Prove meter on a known supply - Test all conductors

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• Phase Rotation - Connect Phase rotation meter to each phase - Energex supply into the building is anti lock wise 321 or CBA - Most fans and motors are require clockwise rotation 123 or ABC - To change supply rotation change any 2 phases.

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• Insulation Resistance - Ensure earth and metering is disconnected from circuit when testing - Test voltage must be twice the nominal voltage - Test Single phase circuits at 500V, ensure circuit is disconnected from the RCD. Test at 250V if there are circuits that contain electronic equipment that cannot be disconnected. - Test 3 phase circuits at 1000V. - Test shall be no lower than 1M Ohm unless it is for a sheathed heating element which shall be no less than 0.01M Ohm

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• Earth Continuity - Use a trailing earth lead to each point from the Switchboard - The resistance of the Main Earthing conductor or any equipotential bonding conductor shall be no less than 0.5 Ohm. - For final sub-circuits the resistance values for the earthing conductor are given in table 8.2 in the AS 3000 as a function of the rating associated with the over current protective device.

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  • Yes
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• Earth Fault Loop Impedance - This test is to ensure that the impedance of the circuit is low enough for the circuit breaker to trip within the required time if a fault occurred - Table 8.1 in AS 3000 provides Maximum values of impedance based on 230V. - To calculate the max fault loop impedance multiply the circuit breaker rating by 7.5 for C Type circuit breaker then divide the nominal voltage of the circuit by this value. (Example for a 20A breaker 7.5x20=150. For a 240V circuit 240/150=1.6 Ohms)

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  • Yes
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• RCD Testing - There are 2 types of RCD (Type 1 - 10mA for Medical installations and Type 2 - 30mA for all other installations) - Ensure RCD’s offer RCD and circuit overload protection - Additional protection by RCD required for final sub circuits up to 32A

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